Mila Kunis and Ashton Kutcher are reportedly planning a wedding ceremony before the arrival of their first child.

Rumours of a baby have surrounded the couple for months, with 30-year-old Mila appearing to show off a growing bump in recent snaps of the actress.

While they are yet to confirm the happy news, those close to the loved-up stars confess Mila and Ashton are planning to tie the knot before the baby is born.

"Mila is starting to show and desperately wants to be married before the baby arrives. She's from quite a traditional Jewish family so it's important to her," a source told British magazine Grazia.

"Ashton is all for it and they have agreed to get married in an LA registry office, then have a small dinner reception at their home with just their family. They've written their own vows and plan to announce the baby's name to their family on the night."

The latest reports suggest that the Hollywood couple are expecting a baby girl, something that's said to have excited them both.

Although Ashton was previously married to Demi Moore, this is the first child for both him and Mila.

While a small ceremony seems imminent, the happy couple are also thought to be planning a much more lavish bash once their new family member has arrived.

"Ashton can't wait for them to become husband and wife and he's very excited about the next few months. Once the baby is here, they know they'll want to introduce her to all of their nearest and dearest, so they're planning a belated 'marriage and carriage' Jewish wedding bash with their friends and family to celebrate their new arrival," the insider added.